1 1/2"

The 1 1/2" Wilkins Model 350 double check assemblies began production in 2004 and are currently still being produced. They feature a bronze carriage that holds a plastic body which houses the check assemblies. The plastic housing rests into the bronze carriage and is locked in with a wedge system. The device is an inline module check design. In 2010, Wilkins introduced the 350XL, which is the lead free version. A blowout fitting is available for simple winterization. No special tools are required for servicing.

The 1 1/2" Wilkins Model 350XL double check assemblies began production in 2010 and are currently still being produced. The 350XL is the lead free version of the model 350. They feature a lead free bronze carriage that holds a plastic body which houses the check assemblies. The plastic housing rests into the bronze carriage and is locked in with a wedge system. The device is an inline module check design. No special tools are required for servicing.

The 1 1/2" Wilkins 375 Reduced Pressure Zone began production in 2004 and is still currently in production. The 375 features a unique plastic insert cartridge that houses both checks and relief valve in a compact design and sets into a bronze body. The checks are inline modular design, with self contained check assemblies. Ideal for situations that require winterization, as the whole cartridge can be removed in freezing conditions. A blowout fitting is also available for ease of system winterization. No special tools are required for servicing.

The 1 1/2" Wilkins 375XL Reduced Pressure Zone began production in 2010 and is still currently in production. The 375XL features a unique plastic insert cartridge that houses both checks and relief valve in a compact design and sets into a bronze body. The checks are inline modular design, with self contained check assemblies. Ideal for situations that require winterization, as the whole cartridge can be removed in freezing conditions. A blowout fitting is also available for ease of system winterization. No special tools are required for servicing.

The 1 1/2" Wilkins 550 Double Check Valve backflow preventer was introduced in 1975 under the Richwell Model DC name. Approximately 1978 it was sold to the Neptune Meter Company. The Neptune Company changed the model to 550 and produced it until 1984. Wilkins bought the rights to the device in 1984 and it was discontinued in 1995. The body was made of bronze and had non replacable bronze seats cast into the body. Early models featured bronze check poppets. Wilkins changed the poppet construction to plastic in 1985. Check assemblies were not self contained and covers had spring tension against them. Hard parts have been discontinued for the Model 550 and rubber parts are the only avilable service parts. No special tools are required for servicing.

The 1 1/2" Wilkins 575 Reduced Pressure Zone backflow preventer was introduced in 1975 under the Richwell Model DC name. Approximately 1978 it was sold to the Neptune Meter Company. The Neptune Company changed the model to 575 and produced it until 1984. Wilkins bought the rights to the device in 1984 and it was discontinued in 1995. The body was made of bronze and had non replacable bronze seats cast into the body. Early models featured bronze check poppets. Wilkins changed the poppet construction to plastic in 1985. Many different check covers were produced, some made of bronze, some made of plastic. Some covers bolted on while some threaded into the body. Check assemblies were not self contained and covers had spring tension against them. The relief valve is attached to the body by a bolted flange and uses an external sensing line. Relief valve design changed through the years and early model parts are no longer available. The relief valve seat is replacable. Hard parts have been discontinued for the Model 575 and rubber parts are the only avilable service parts. No special tools are required for servicing.

The 1 1/2" Wilkins model 720 & 720A pressure vacuum breaker began production in 1975 under the SMR name. It was sold to Neptune Meter Company in 1978. Wilkins bought the rights to the device in 1984. It is a bronze bodied, fully testable device. The "A" suffix is for the reworked air inlet design. Both models will accept the modified air inlet parts. In 2010, the test cocks were moved from the body to the ball valves. No special tools are required for servicing.

The 1 1/2" Wilkins 950 Double Check Valve Assembly was introduced in 1990 and was replaced by the 950XL in the mid-1990's. The difference in the 950XL was the plastic replacable seats. Original 950 models do not have replacable seats.The 950 is a two cover, wye pattern design. The checks are a poppet style and are not self contained and there is spring pressure against the covers. No special tools are required to service.

The 1 1/2" Wilkins 950XL Double Check Valve Assembly was designed to replace the original 950 and 950A models. The difference in the 950XL was the plastic replacable seats. The 950XL is a two cover, wye pattern design. The checks are a poppet style and are not self contained and there is spring pressure against the covers. The body is of bronze construction. A seat removal tool is required for seat service.

The 1 1/2" Wilkins 950XLT Double Check Valve Assembly was introduced in 1997 and is still currently in production. The 950XLT is a two cover, top load design design with test cocks on top of the device. It was created as an alternative to the 950XL which is a wye pattern and has side test cocks. The checks are a poppet style and are not self contained. There is spring pressure against the covers. A seat removal tool is required for seat service.

The 1 1/2" Wilkins 950XLT2 Double Check Valve Assembly was introduced in 2010 as a lead free version of the 950XL. The 950XLT2 is a two cover design. The checks are a poppet style and are not self contained and there is spring pressure against the covers. The body is of lead free bronze construction. A seat removal tool is required for seat service.

The 1 1/2" Wilkins 975 Reduced Pressure Zone backflow preventer was introduced in 1990 and was discontinued in 1992. The 975 was replaced by the 975XL which featured removable seats, while the original 975 did not have removable seats. All other parts will interchange between the 975 and 975XL models. The checks are a poppet style and are not self contained and there is spring pressure against the covers. The relief valve is a piston style with an internal sensing line. This device does not meet low lead laws introduced in 2014. A lead free version is available, known as the 975XL2. No special tools are required for servicing.

The 1 1/2" Wilkins 975XL Reduced Pressure Zone backflow preventer was introduced in 1993 to replace the earlier model 975. The 975XL features removable seats, while the original 975 did not have removable seats. All other parts will interchange between the 975 and 975XL models. The checks are a poppet style and are not self contained and there is spring pressure against the covers. The relief valve is a piston style with an internal sensing line. This device does not meet low lead laws introduced in 2014. A lead free version is available, known as the 975XL2. A seat removal tool is required for seat service.

The 1 1/2" Wilkins 975XL2 Reduced Pressure Zone backflow preventer was introduced in 2010 as a lead free alternative to the model 975XL. The 975XL2 features a three cover design, with removable seats. All parts will interchange between the 975XL and 975XL2 models. The checks are a poppet style and are not self contained and there is spring pressure against the covers. The relief valve is a piston style with an internal sensing line. This device meets low lead laws introduced in 2014. A seat removal tool is required for seat service.